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Re: curl_multi_timeout and the multi_socket API
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From: Daniel Stenberg via curl-library <curl-library_at_cool.haxx.se>
Date: Mon, 5 Apr 2021 22:43:09 +0200 (CEST)
On Mon, 5 Apr 2021, Henrik Holst wrote:
> And this particular run with 1ms did not lead to 100% cpu, it was when curl
> gave me 0ms as timeout as the last timeout which lead me to call
> curl_multi_socket_action() every 0ms, which turned it into a busy wait loop
> and hence the 100% cpu. Shouldn't curl return -1 as infinte timeout instead
> there since it's waiting for read on a connected socket (after having sent
> the request in full) with no defined CURLOPT_TIMEOUT?
0 means that there's a timeout pending that libcurl wants to take care of at
once so then it can't return -1 since -1 means no timeout at all.
So no, it cannot return -1 when it means 0.
Date: Mon, 5 Apr 2021 22:43:09 +0200 (CEST)
On Mon, 5 Apr 2021, Henrik Holst wrote:
> And this particular run with 1ms did not lead to 100% cpu, it was when curl
> gave me 0ms as timeout as the last timeout which lead me to call
> curl_multi_socket_action() every 0ms, which turned it into a busy wait loop
> and hence the 100% cpu. Shouldn't curl return -1 as infinte timeout instead
> there since it's waiting for read on a connected socket (after having sent
> the request in full) with no defined CURLOPT_TIMEOUT?
0 means that there's a timeout pending that libcurl wants to take care of at
once so then it can't return -1 since -1 means no timeout at all.
So no, it cannot return -1 when it means 0.
-- / daniel.haxx.se | Commercial curl support up to 24x7 is available! | Private help, bug fixes, support, ports, new features | https://www.wolfssl.com/contact/ ------------------------------------------------------------------- Unsubscribe: https://cool.haxx.se/list/listinfo/curl-library Etiquette: https://curl.se/mail/etiquette.htmlReceived on 2021-04-05